Check the switch like this: DOOR LOCK SWITCH 1. Remove door lock switch. See DOOR LOCK SWITCH under REMOVAL & INSTALLATION. With switch in released position, continuity should not exist between terminal No. 4 and terminals No. 3 and 6. See Fig. 3 . 2. Press switch to UNLOCK position. Continuity should exist between switch terminals No. 3 and 4. Press switch to LOCK position. Continuity should exist between terminals No. 4 and 6. If continuity is not as specified, replace switch.
Another problem could be the wires where they pass from the door to the car, bend, and over time can break. check for that. If nothing turns up, you need to scan for trouble codes with a Ford capable scanner. Or chance it's the GEM(Generic electronic module) Aboutt 200.00!
Thursday, September 10th, 2009 AT 3:29 PM